This classic marble cake recipe is a perfect combination of vanilla and chocolate flavors. The cake is moist, tender, and has a beautiful swirl pattern. It's a perfect dessert for any occasion, and it's easy to make. The recipe uses simple ingredients like flour, sugar, eggs, butter, milk, and cocoa powder. The cake is baked in a loaf pan and can be served with a dusting of powdered sugar or a dollop of whipped cream.